Diaphragm for recorders or reproducers.



No. 892,205- PATENTED JUNE 30, 1908.

. G. J. ANDERSON;

' DIAPHRAGM FOR REOORDERS OR REPRODUCBRS.

' .urucuxon FILED 00'1.1B.1907.

arana o1eare,at;.

GUSTAF J. ANDERSON, OF ALLSTON, MASSACHUSETTS.

DIAPHRAGM FOR RECORDERS 0R REPRGDUGERS.

Specification of Letters Patent. Application flled. October 16, 1907. Serial No. 9597,5102.

T 0 all whom it may concern: Be it known that I, GUsTAF J. ANDERSON, citizen of the United States, residing at Allston, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements in Dia hragms for Recorders and Reproducers; an I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to sound recording and reproducing instruments such as phonoraphs and graphophones and more articul arly to certain improvements in t e diaphragms ofthe recorders and re roducers,

the object being to roduce a iaphragm which will be en tlrely ree from the frying or scratching so common in these instruments as now constructed and one which will reproduce the sounds clear and resonant and entirely free of the Objectionable frying pr scratching s'ounds.

Many attempts have been made to eliminate the objectionable frying. or scratching sounds in these instruments but as yet no one seems to have solved the problem and in conso uence What would be in other respects a perfect machine and a source of much leasure to the listener is marred by the frymg and scratching'sounds of thediaphragms To the end of producing a sound recording and reproducing apparatus which shall be entirely free from the objectionable noises referred to, my invention consists of the diaphragm which will now be described and claimed.

My invention is illustrated in the accompanying drawing, in which 1-,;

Figure 1 illustrates a transverse sectional view of a reproducer of a phono raph showing my improved diaphragm t erein, and

, Patented June 30, 1908.

oept as hereinafter described,'does not differ from similar devices of the prior art.

My improved dia 'hragr'n-3 is made of amher and except for t is diiierence is like those now in general use. disk of the usual shape and thickness, circular in form; it may be, however, of any shape in outline. I preferably make itof Itconsistsof a thin block amber cut in circular form and then ground down' and dressed to the desired thickness, but it may be of molded amber. By the use of amber I have demonstrated by experiment that the objectionable fryin and scratching sounds are substantia y eliminated. 1

Having described my invention Iclaim as new and'desire to protect by Letters Patent of the United States', 1. A diaphragm for sound recording and reproducin instruments comprising a thin plate or dis of amber.

2. A diaphragm for sound recording and reproducing instruments comprising a thin,

plate or disk of molded amber.

In testimony whereof I afiix my signature, in presence of two witnesses.

GUSTAF J. ANDERSON.

Witnesses T.'HART ANDERSON, MARY F. KENNEY. 

